Decking boards span from joist to joist.
Floor joist spans wood deck.
This article explains typical spans for deck joists deck beams and deck flooring giving both standard span tables and a quick rule of thumb that works pretty well.
Steel joists offer a stronger straighter and potentially safer alternative to wood.
In typical deck construction with a ledger on one side of the joist and beam on the other the size of the joists is driven by the size of the deck and based on the general maximum spans mentioned above.
Section r507 5 notes that deck joists can cantilever up to 1 4 of the joist span.
Simplified maximum span tables for selected visual and mechanical grades of southern pine lumber in sizes 2 4 thru 2 12.
Framing tables for decks.
For best results refer to our wood and composite deck joist span table.
If you will run decking at an angle you might need to put the joists closer together.
Joist size spacing between joists decking material and wood species.
Recommended or allowable joist beam spans.
But you ll notice when you look at the portion of the span table for joists with cantilevers that the joist span for decks with a cantilever is often less than the span for the same sized joist without cantilevers.
Again it s important to know your local codes.
Deck joists have a different maximum span length depending upon the size spacing and framing material that you re creating your deck with.
The deck joist span chart below is based on the updated codes from the international residential code 2015 which for the first time specifically addressed these deck design considerations.
Plus unlike floor joists decks needs to be able to support the extra weight of pressure treated wood handrails as well as snowfall during winter.
Steel joists such as trex elevations are machine made making each joist an identical twin.
Joist beam spans sizes.
Joist span table use these tables to determine floor joist spans based on grade of lumber size of joist floor joist spacing and a live load of 30 lbs ft 2 or 40 lbs ft 2 these tables can also be used to determine deck joist span.
Listed are 46 tables based on common loading conditions for floor joists ceiling joists and rafters.
If you use 5 4 decking joists must be no farther apart than 16 inches.
The larger the deck the larger the joists.
Decking made of 2x4s or 2x6s can span up to 24 inches.
Floor joist span tables for various sizes and species of wood.
Even when using the strongest wood to build joists for a deck that wood is still subject to the elements and can bend bow or warp with time.
View joist rafter tables.
